SizeGrip, Version 1.2a (alt)
Hinweis: dies ist nicht die neueste Version!
Datei: SizeGripHWND.pas
{ SizeGripHWND.pas Delphi component to add a size grip (like if you use a status bar) to the lower right corner of any window control. This is intended for small footprint non-VCL delphi applications and paints the size grip just using the standard API functions (no layout control, no themes). Version 1.2a - always find the most current version at http://flocke.vssd.de/prog/code/pascal/sizegrip/ Copyright (C) 2005, 2006 Volker Siebert <flocke@vssd.de> All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. } unit SizeGripHWND; interface uses Windows, Messages; procedure SetWindowSizeGrip(hWnd: HWND; Enable: boolean); implementation const SizeGripProp = 'SizeGrip'; type TWndProc = function (hWnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall; PGripInfo = ^TGripInfo; TGripInfo = record OldWndProc: TWndProc; Enabled: boolean; GripRect: TRect; end; function SizeGripWndProc(hWnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall; var Info: PGripInfo; dc: HDC; pt: TPoint; // Invalidate the current grip rectangle procedure InvalidateGrip; begin with Info^ do if (GripRect.Right > GripRect.Left) and (GripRect.Bottom > GripRect.Top) then InvalidateRect(hWnd, @GripRect, true); end; // Update (and invalidate) the current grip rectangle procedure UpdateGrip; begin with Info^ do begin GetClientRect(hWnd, GripRect); GripRect.Left := GripRect.Right - GetSystemMetrics(SM_CXHSCROLL); GripRect.Top := GripRect.Bottom - GetSystemMetrics(SM_CYVSCROLL); end; InvalidateGrip; end; function CallOld: LRESULT; begin Result := CallWindowProc(@Info^.OldWndProc, hWnd, Msg, wParam, lParam); end; begin Info := PGripInfo(GetProp(hWnd, SizeGripProp)); if Info = nil then Result := DefWindowProc(hWnd, Msg, wParam, lParam) else if not Info^.Enabled then Result := CallOld else begin case Msg of WM_NCDESTROY: begin Result := CallOld; SetWindowLong(hWnd, GWL_WNDPROC, LongInt(@Info^.OldWndProc)); RemoveProp(hWnd, SizeGripProp); Dispose(Info); end; WM_PAINT: begin Result := CallOld; if wParam = 0 then begin dc := GetDC(hWnd); DrawFrameControl(dc, Info^.GripRect, DFC_SCROLL, DFCS_SCROLLSIZEGRIP); ReleaseDC(hWnd, dc); end; end; WM_NCHITTEST: begin pt.x := TSmallPoint(lParam).x; pt.y := TSmallPoint(lParam).y; ScreenToClient(hWnd, pt); if PtInRect(Info^.GripRect, pt) then Result := HTBOTTOMRIGHT else Result := CallOld; end; WM_SIZE: begin InvalidateGrip; Result := CallOld; UpdateGrip; end; else Result := CallOld; end; end; end; { Note that SetWindowSizeGrip(..., false) does not really remove the hook - it just sets "Enabled" to false. The hook plus all data is removed when the window is destroyed. } procedure SetWindowSizeGrip(hWnd: HWND; Enable: boolean); var Info: PGripInfo; begin Info := PGripInfo(GetProp(hWnd, SizeGripProp)); if (Info = nil) and Enable then begin New(Info); FillChar(Info^, SizeOf(TGripInfo), 0); with Info^ do begin Info^.OldWndProc := TWndProc(Pointer(GetWindowLong(hWnd, GWL_WNDPROC))); GetClientRect(hWnd, GripRect); GripRect.Left := GripRect.Right - GetSystemMetrics(SM_CXHSCROLL); GripRect.Top := GripRect.Bottom - GetSystemMetrics(SM_CYVSCROLL); end; SetProp(hWnd, SizeGripProp, Cardinal(Info)); SetWindowLong(hWnd, GWL_WNDPROC, LongInt(@SizeGripWndProc)); end; if (Info <> nil) then if Enable <> Info^.Enabled then with Info^ do begin Enabled := Enable; if (GripRect.Right > GripRect.Left) and (GripRect.Bottom > GripRect.Top) then InvalidateRect(hWnd, @GripRect, true); end; end; end. |